"The first principle of ethical power is Purpose... It is the picture you have of yourself - the kind of person you want to be or the kind of life you want to lead."

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When I try to outline the history of ethical life, it's sometimes possible to find evidence for a hypothesis about how important transitions actually went. Often, however, that isn't so. There are many facts about human life in the Paleolithic we're never likely to know.

— Philip Kitcher